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<div class="title">tcpserver.c</div>  </div>
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<a href="tcpserver_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="tcp_8h.html">tcp.h</a>&quot;</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;</div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment">/***************************************************************</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment">tcpserver.c</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment">Forks at each connection and provides the caller with </span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment">a socket descriptor. A signal handler provides waiting for</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment">children&#39;s exit status.</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment"> ***************************************************************/</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"><a class="line" href="tcpserver_8c.html#af7ed50414fc8a6d6e37342e811411e37">    9</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="tcpserver_8c.html#af7ed50414fc8a6d6e37342e811411e37">sigchld_handler</a> (<span class="keywordtype">int</span> signum)</div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;{</div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;  <span class="keywordtype">int</span> status;</div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;  signal (signum, <a class="code" href="tcpserver_8c.html#af7ed50414fc8a6d6e37342e811411e37">sigchld_handler</a>);</div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;  <span class="keywordflow">if</span> (waitpid(WAIT_ANY, &amp;status, WNOHANG) &lt; 0)</div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;    perror(<span class="stringliteral">&quot;sigchld_handler: error\n&quot;</span>);</div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;}</div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;</div>
<div class="line"><a name="l00017"></a><span class="lineno"><a class="line" href="tcpserver_8c.html#af90d1d8229d310a8db3d7f4fd5dc3533">   17</a></span>&#160;<span class="keywordtype">int</span> <a class="code" href="tcpserver_8c.html#af90d1d8229d310a8db3d7f4fd5dc3533">makeserver</a> (uint16_t port)</div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;{</div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;  <span class="keywordtype">int</span> sock;                           <span class="comment">//main listening socket</span></div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;  sock = <a class="code" href="tcpserver_8c.html#ad79c8b2efdf636a561906f404b1d5726">make_socket</a>(port);</div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;  <span class="keywordflow">if</span> (listen(sock, <a class="code" href="tcp_8h.html#a0128d1b0dc57cbb75797eab9e1e50280">SERVER_QLEN</a>) &lt; 0)</div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;    {</div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;      perror(<span class="stringliteral">&quot;Listen failed. Exiting.&quot;</span>);</div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;      exit(EXIT_FAILURE);</div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;    }</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;  signal(SIGCHLD, <a class="code" href="tcpserver_8c.html#af7ed50414fc8a6d6e37342e811411e37">sigchld_handler</a>); <span class="comment">//estabilish handler for managing SIGCHLD</span></div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;  <span class="keywordflow">while</span>(1)</div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;    {</div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;      <span class="keyword">struct </span>sockaddr_in client;</div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;      <span class="keywordtype">int</span> sd;</div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;      <span class="keywordtype">int</span> size;</div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;      size = <span class="keyword">sizeof</span>(client);</div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;      <span class="keywordflow">if</span> ((sd = accept(sock, (<span class="keyword">struct</span> sockaddr *)&amp;client, &amp;size)) &lt; 0)</div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;    {</div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;      perror(<span class="stringliteral">&quot;Error while accepting connection&quot;</span>);</div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;    }</div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;      <span class="keywordflow">else</span></div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;    {</div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;      pid_t pid;</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;      <span class="keywordflow">if</span>((pid = fork())==0) <span class="comment">//we are in the child process</span></div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;        {</div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;          close(sock); <span class="comment">//should not interfere with the parent copy</span></div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;          <span class="keywordflow">return</span> (sd);</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;        }</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;    }</div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;    }</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;}</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;<span class="comment">/* void makeserverh (uint16_t port, int (* handler)(int)) */</span></div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;<span class="comment">/* { */</span></div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;  </div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;<span class="comment">/*   FD_ZERO (sd_set);   */</span></div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="comment">/*   int sd;                  //main socket descriptor */</span></div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="comment">/*   int size;                //sizeof(client) */</span></div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;<span class="comment">/*   //  fd_set * active_ds; */</span></div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;<span class="comment">/*   struct sockaddr_in client; */</span></div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;<span class="comment">/*   sd = make_socket(port); */</span></div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;<span class="comment">/*   size = sizeof(client); */</span></div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;<span class="comment">/*   if (listen(sd) &lt; 0) */</span></div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;<span class="comment">/*     { */</span></div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;<span class="comment">/*       perror(&quot;makeserverfs: listen()&quot;); */</span></div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;<span class="comment">/*       exit(EXIT_FAILURE); */</span></div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;<span class="comment">/*     } */</span></div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;<span class="comment">/*   FD_SET (sd, sd_set); */</span></div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;<span class="comment">/*   while (1) */</span></div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;<span class="comment">/*     { */</span></div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;<span class="comment">/*       int newsd; //new socket descriptor */</span></div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;<span class="comment">/*       if (select (FD_SETSIZE, sd_set, NULL, NULL, NULL) &lt; 0) */</span></div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;<span class="comment">/*  { */</span></div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;<span class="comment">/*    perror(&quot;makeserverfs: select()&quot;); */</span></div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;<span class="comment">/*    exit(EXIT_FAILURE); */</span></div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;<span class="comment">/*  } */</span></div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;<span class="comment">/*       int i; */</span></div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;<span class="comment">/*       for (i = 0; i&lt;FD_SETSIZE; i++) */</span></div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;<span class="comment">/*  { */</span></div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;<span class="comment">/*    if (FD_ISSET(i, sd_set)) */</span></div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;<span class="comment">/*      { */</span></div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;<span class="comment">/*        if (i == sd) //the main socket is active and receiving connection request */</span></div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;<span class="comment">/*      { */</span></div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;<span class="comment">/*        if ((newsd = accept(sd, (struct sockaddr *)&amp;client, &amp;size)) &lt; 0)  */</span></div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;<span class="comment">/*          { */</span></div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;<span class="comment">/*            perror(&quot;makeserverfs: accept()&quot;); */</span></div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;<span class="comment">/*          } */</span></div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;<span class="comment">/*        else { */</span></div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;<span class="comment">/*          //FD_SET(newsd, active_ds); */</span></div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;<span class="comment">/*          FD_SET(newsd, sd_set); */</span></div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;<span class="comment">/*          if ((* handler)(newsd); */</span></div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;<span class="comment">/*        } */</span></div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;<span class="comment">/*      } */</span></div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;<span class="comment">/*        else { */</span></div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;<span class="comment">/*      //another socket is receiving input */</span></div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;<span class="comment">/*        } */</span></div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;<span class="comment">/*      } */</span></div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;<span class="comment">/*  } */</span></div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;</div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;</div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;<span class="comment">/*     } */</span></div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;<span class="comment">/* } */</span></div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;</div>
<div class="line"><a name="l00102"></a><span class="lineno"><a class="line" href="tcpserver_8c.html#ad79c8b2efdf636a561906f404b1d5726">  102</a></span>&#160;<span class="keywordtype">int</span> <a class="code" href="tcpserver_8c.html#ad79c8b2efdf636a561906f404b1d5726">make_socket</a> (uint16_t port)</div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;{</div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;  <span class="keywordtype">int</span> descriptor;</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;  <span class="keyword">struct </span>sockaddr_in name;</div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;  <span class="keywordflow">if</span> ((descriptor = socket(PF_INET, SOCK_STREAM, 0)) &lt; 0)</div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;    {</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;      perror(<span class="stringliteral">&quot;Error while creating socket&quot;</span>);</div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;      exit(EXIT_FAILURE);</div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;    }</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;  name.sin_family = AF_INET;</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;  name.sin_port = htons(port);</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;  name.sin_addr.s_addr = htonl(INADDR_ANY);</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;  <span class="keywordflow">if</span> (bind(descriptor, (<span class="keyword">struct</span> sockaddr *) &amp;name, <span class="keyword">sizeof</span>(name))&lt;0)</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;    {</div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;      perror(<span class="stringliteral">&quot;bind&quot;</span>);</div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;      exit(EXIT_FAILURE);</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;    }</div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;</div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160; <span class="keywordflow">return</span> (descriptor);</div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;</div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;}</div>
<div class="ttc" id="tcpserver_8c_html_af90d1d8229d310a8db3d7f4fd5dc3533"><div class="ttname"><a href="tcpserver_8c.html#af90d1d8229d310a8db3d7f4fd5dc3533">makeserver</a></div><div class="ttdeci">int makeserver(uint16_t port)</div><div class="ttdef"><b>Definition:</b> <a href="tcpserver_8c_source.html#l00017">tcpserver.c:17</a></div></div>
<div class="ttc" id="tcp_8h_html_a0128d1b0dc57cbb75797eab9e1e50280"><div class="ttname"><a href="tcp_8h.html#a0128d1b0dc57cbb75797eab9e1e50280">SERVER_QLEN</a></div><div class="ttdeci">#define SERVER_QLEN</div><div class="ttdef"><b>Definition:</b> <a href="tcp_8h_source.html#l00012">tcp.h:12</a></div></div>
<div class="ttc" id="tcpserver_8c_html_ad79c8b2efdf636a561906f404b1d5726"><div class="ttname"><a href="tcpserver_8c.html#ad79c8b2efdf636a561906f404b1d5726">make_socket</a></div><div class="ttdeci">int make_socket(uint16_t port)</div><div class="ttdef"><b>Definition:</b> <a href="tcpserver_8c_source.html#l00102">tcpserver.c:102</a></div></div>
<div class="ttc" id="tcpserver_8c_html_af7ed50414fc8a6d6e37342e811411e37"><div class="ttname"><a href="tcpserver_8c.html#af7ed50414fc8a6d6e37342e811411e37">sigchld_handler</a></div><div class="ttdeci">void sigchld_handler(int signum)</div><div class="ttdef"><b>Definition:</b> <a href="tcpserver_8c_source.html#l00009">tcpserver.c:9</a></div></div>
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